Regular Article – Plasma Physics
Diffusion coefficients of dusty plasmas in electric field
Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education (MOE), School of Energy and Power Engineering, Xi’an Jiaotong University, 710049, Xi’an, China
2 Modeling and Simulations Laboratory, Department of Physics, Government College University Faisalabad (GCUF), Allama Iqbal Road, 38040, Faisalabad, Pakistan
Accepted: 7 November 2022
Published online: 27 November 2022
In this work, the effects of normalized electric field (E*) on parallel diffusion coefficients (D||) and perpendicular diffusion coefficients (D┴) are investigated through equilibrium molecular dynamics (EMD) simulations in three-dimensional strongly coupled dusty plasmas. The self-diffusion coefficients (DE) for three dimensions also have been calculated for the wide range of plasma Coulomb coupling (Γ) and Debye screening (κ) parameters with the various system sizes. The DE, D|| and D┴ are investigated using the Einstein relation with EMD simulations. The effects of constant and varying normalized E* on D|| and D┴ have been computed for the different system sizes. Simulation outcomes are outstanding in the combined effects of E* and κ and give well-matched DE, D||(E* = 0, 0.01) and D┴(E* = 0, 0.01) values at low-intermediate to large Γ with varying small-intermediate to large N. The D|| and D┴ in the limit of varying E* values are accounted for an appropriate range Γ and κ parameters. At varying E* values, it is revealed that the D|| increases and D┴ decreases with an increase in E*; however, it decreases with an increase in Γ but within statistical limits. The simple analytical temperature scaling law is tested for variation of scaled (Einstein frequency) DE, D||(E* = 0.01) and D┴(E* = 0.01). It has been shown that the present EMD simulations data obtained for the appropriate range of E* strength up to 0.01 ≤ E* ≤ 1.0 to understand the phase transitions, fundamental nature of E* linearity and anisotropy of dusty plasma systems.
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